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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ad0e9c4157025d6f0de2b38cde42c1b743c6d83e86fe271e0c906a042bc574' 
  AND token = 'A3UGrIV/EUjWT496QITH8yaC4ZvW5HazTTBsbHnfB8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}